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Lubov Fominskaja [6]

3 years ago

5

Earth pulls on the Moon with a gravitational force, keeping it in its nearly circular, 27‑day orbit. According to Newton's third

law, the reaction force to Earth's pull on the Moon is_______.

1 answer:

arlik [135]3 years ago

4 0

Answer:

Centripetal Force

Explanation:

The reaction to the earth's pull on the moon is the centripetal force

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The decided by staring at and observing the stars.

Explanation:

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An object is moving east with a constant speed of 30 m/s for 5 seconds. What is the object’s acceleration?

Shtirlitz [24]

Answer:

6 m/s²

Explanation:

From the question given above, the following data were obtained:

Velocity (v) = 30 m/s

Time (t) = 5 s

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Acceleration is defined mathematically as:

Acceleration (a) = Velocity (v) /time (t)

a = v /t

With the above formula, we can obtain the acceleration of the object as follow:

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4 years ago

If two firecrackers produce a sound level 85dB. What level does the explosion of one firecracker produce?

mars1129 [50]

Level of sound is related to intensity by this equation

$L = 10 Log \frac{I}{I_o}$

given that

L = 85 dB

also we know that

$I_o = 10^{-12} W/m^2$

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$85 = 10 Log \frac{I}{10^{-12}}$

By solving above equation

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now above is the intensity due to two firecrackers and if we wish to find the sound level of one firecracker then we will find its half level intensity

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now again by above formula

$L = 10 Log \frac{1.58 * 10^{-4}}{10^{-12}}$

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A 70-kg astronaut (including spacesuit and equipment) is floating at rest a distance of 13 m from the spaceship when she runs ou

Keith_Richards [23]

Answer:

Explanation:

mass of the astronaut including the spacesuit, $M=30$

distance of astronaut from the spaceship, d = 13 m

mass of the oxygen tank, m = 3 kg

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a)

<u>Using the conservation of linear momentum:</u>

total momentum before collision = total momentum after collision

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She mush hold her breath until she reaches the spaceship, i.e.

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